diff --git a/tests/include/test/drivers/key_management.h b/tests/include/test/drivers/key_management.h
index 9a68777..7b5c4c7 100644
--- a/tests/include/test/drivers/key_management.h
+++ b/tests/include/test/drivers/key_management.h
@@ -67,10 +67,6 @@
 psa_status_t mbedtls_test_opaque_init(void);
 void mbedtls_test_opaque_free(void);
 
-psa_status_t mbedtls_test_opaque_wrap_key(
-    const uint8_t *key, size_t key_length, uint8_t *wrapped_key_buffer,
-    size_t wrapped_key_buffer_size, size_t *wrapped_key_buffer_length);
-
 psa_status_t mbedtls_test_opaque_unwrap_key(
     const uint8_t *wrapped_key, size_t wrapped_key_length, uint8_t *key_buffer,
     size_t key_buffer_size, size_t *key_buffer_length);
diff --git a/tests/src/drivers/test_driver_key_management.c b/tests/src/drivers/test_driver_key_management.c
index 4188c25..a3d532d 100644
--- a/tests/src/drivers/test_driver_key_management.c
+++ b/tests/src/drivers/test_driver_key_management.c
@@ -125,7 +125,7 @@
  * The argument wrapped_key_buffer_length is filled with the wrapped
  * key_size on success.
  * */
-psa_status_t mbedtls_test_opaque_wrap_key(
+static psa_status_t mbedtls_test_opaque_wrap_key(
     const uint8_t *key,
     size_t key_length,
     uint8_t *wrapped_key_buffer,